moritz@SGE:~$ dmesg | grep USB
[    0.794674] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.794751] ehci_hcd 0000:00:1a.7: new USB bus registered, assigned bus number 1
[    0.819550] ehci_hcd 0000:00:1a.7: USB 2.0 started, EHCI 1.00
[    0.819642] hub 1-0:1.0: USB hub found
[    0.819753] ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 2
[    0.839566] ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00
[    0.839650] hub 2-0:1.0: USB hub found
[    0.839717] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.839727] uhci_hcd: USB Universal Host Controller Interface driver
[    0.839810] uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3
[    0.839932] hub 3-0:1.0: USB hub found
[    0.840025] uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 4
[    0.840142] hub 4-0:1.0: USB hub found
[    0.840237] uhci_hcd 0000:00:1a.2: new USB bus registered, assigned bus number 5
[    0.840358] hub 5-0:1.0: USB hub found
[    0.840444] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 6
[    0.840561] hub 6-0:1.0: USB hub found
[    0.840646] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 7
[    0.840761] hub 7-0:1.0: USB hub found
[    0.840847] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 8
[    0.840966] hub 8-0:1.0: USB hub found
[   64.300037] usb 4-1: new low speed USB device using uhci_hcd and address 2
[   64.900029] usb 4-1: new low speed USB device using uhci_hcd and address 3
[   65.500028] usb 4-1: new low speed USB device using uhci_hcd and address 4
[   65.980084] hub 4-0:1.0: unable to enumerate USB device on port 1
[  132.410051] hub 4-0:1.0: unable to enumerate USB device on port 1
[  375.700071] hub 4-0:1.0: unable to enumerate USB device on port 1
moritz@SGE:~$